奈奎斯特与超奈奎斯特光信号产生与信号处理

Optical transmission with high spectrum efficiency is one of the key targets in future optical communication and is also the key to lower the cost and power consumption of per bit per Hz transmission and futher realize high-capacity optical transmission. Compared with increasing the order of modulation format, compressing the frequency spectrum of optical signals so as to reduce carrier spacing and increase transmission density is another new dimension of spectrum efficiency improvement. .The project aims to realize high-performance and high spectrum efficiency optical transmission without Inter Symbol Interference (ISI) and Inter Carrier Interference(ICI) under the narrowest bandwidth based on the optimal Nyuqist pulse shaping theory in nonlinear channel. Based on the proposed novel ICI-ISI joint equalization mechanism, the project will further narrow the channel space through Super-Nyquist frequency spectrum compression so as to improve the transmission performance of Super-Nyquist signals effectively. At the same time, the project proposes a novel multi-module blind equalization algorithm to realize the signal recovery of Nyqusit and Super-Nyqusit signals with super-high orders.The project aims to develop a new approach to realize optical transmission with high spectrum efficiency, and will also reveal the implementation mechanism of Nyquist and Super-Nyqusit optical transmission, which has profound significance both in theory research and practice.

高谱效率光传输是光通信发展的追求目标，是未来降低每比特每赫兹的成本和功耗实现大容量光传输的关键。与提高光信号的调制格式阶数相比，压缩信号频谱降低载波间隔，从而提高信息传输密度，是提高光传输频谱效率的一个新维度。.本项目基于奈奎斯特准则，通过非线性信道的最优化奈奎斯特脉冲成形理论，实现最小带宽下无码间干扰和无信道干扰的高性能高谱效率光传输；通过超奈奎斯特频谱压缩进一步降低信道间隔，基于所提出的新型ICI和ISI联合均衡机制，有效的提高超奈奎斯特光传输性能；项目同时提出了一种新型环形和矩形分割的多模盲均衡算法，解决了极高阶数字奈奎斯特与超奈奎斯特信号的信号恢复问题。本项目的开展为实现高谱效率光传输开辟了新的途径，揭示了奈奎斯特和超奈奎斯特光传输的实现机制和均衡方法，具有重要的理论和实际意义。

高谱效率光传输是光通信发展的追求目标，是未来实现大容量光传输的关键，而数字奈奎斯特脉冲成型是灵活、高速与高谱效率的信号产生方式。本项目研究奈奎斯特和超奈奎斯特光信号的产生与信号处理。包括研究超高升阶等熵概率编码和除权预均衡技术实现16384QAM的OFDM光纤直调直检传输。研究超奈奎斯特单带CAP的加权查表预均衡技术，实现1.01Gbps的高速传输。研究多带CAP超奈奎斯特传输的联合MIMO均衡技术。研究高谱效率频分复用（SEFDM）调制技术及其信号检测算法。研究基于奈奎斯特PAM-8调制和时频联合均衡的技术，实现4.05Gb/s的高速可见光传输。研究抗干扰能力强、对非线性损伤容忍度高的几何整形GS-8QAM调制格式等。本项目的研究具有重要的理论和实用意义。